Can't read diagnostic codes

[dh79]

Hi
I'm having problems reading the diagnostic codes on a 92 conti. The check engine light on the dash is on constantly. I borrowed a fancy bdm code reader but when I plug it in at the trunk it is unable to communicate with the car and get the codes. I also tried it with a cheapo code reader with the same result.

It seems that if I turn the air ride system off and on that affects the code reader, but I still can't get it to function properly. I've read something about a second plug (used as a ground maybe?), that is also in the trunk. Do only some cars have this? I can't find one on this car.

The car is running well and mileage seems good but the check engine light is bothering me and I don't like the idea of not being able to read codes. Anybody else have this problem? Any help is appreciated,
thanks.
dh

[Steve Moran]

The connector you are looking for is on the plastic cover that is mounted to the firewall. Look on the passenger side.
and welcome to Lincolns Online, I hope you find what you need here.

[MichiganTeddyBear]

yup you got the wrong connector... the one your looking for is on firewall, passenger side, right up where its easy to get to, if I recall properly.

the one in the trunk is the A/S connector (exactly the same connector shape, and I think same pinouts, but obviously different computer system).

[dh79]

Thanks for the help!!!
I found the right connector and got the codes. The egr is apparently the problem.
Now I gotta get wrenching, thanks again.
dh